ok I have no idea about lights. my little shops always had those 4' walmart lights and they were always in and out. my brother had a 30x50x16 and had 3 of those large industrial type 1 bulb light fixtures and it was very nice inside his. my questions is im building a 40x60x14 all open red iron building and want good lighting, something good for the electric bill also. what does everyone recommend ???